US2593568A

US2593568A - Transmission

Info

Publication number: US2593568A
Application number: US651448A
Authority: US
Inventors: Donald W Kelbel
Original assignee: Borg Warner Corp
Current assignee: Borg Warner Corp
Priority date: 1946-03-02
Filing date: 1946-03-02
Publication date: 1952-04-22
Anticipated expiration: 1969-04-22

Description

April 22, 1952 Filed March 2, 1946 D. w. KELBEL 2,593,568

TRANSMISSION 2 SHEETS-SHEET 1 fzzverzl of" Zonal?! Z fi i jel J I Z D. W. KELBEL TRANSMISSION April 22, 1952 2 SHEETSSHEET 2 Filed March 2, 1946 fizz/enl of Z10. ZfZZeZ more has aneutral condition.

Patented Apr. 22, 1 952 UNITED STATES PATENT DonaldWl Kelbel, Muncie, Ind assignor to-Borg- I Warner Corporation, Chicago,- 111., a, corporation of Illinois Application March 2, 1946; SerialNo; 651,448

- 11 Claims. 1 7 My invention relates to transmissions and more specifically to transmissions particularly adapted for use in automotive vehicles. i

It is an object of my invention to provide an improved transmission which is of such construction that it may be easily controlled.

More particularly it is an object of my invenmatically engage for both relative directions of rotation of the parts associated with the braking means which are adapted to engage with respect to each other and which braking means further- It is a .more specific object to provide such an improved brakingsmeans in. atransmission which comprises :twosets of rollers,v :one set being. operativefor tone relative direction :of irotationsbetween the parts .andztheother set beingcoperative for the other relative :direction of. rotation between the parts. It is contemplated that therollersshall preferably be controlled byimeanssofarroller. cage andithat thecage shall be so controllablethat ieither oneof ithesetsxof rollers .shall be preovented, according .to the :wlishesofthe operator,

from engaging. forthereby neutralizing ithe braking means as ,far as that: particular .set: of rollers :is concerned.

.It. is .more :particularly an object to ;utilize the braking'rneans as abrake .for a reactionmember of the gearing. It is contemplatedthatboth sets of rollers shall besperativeior 'a two-way reduced. speed ratio drive through the-gearing and that the cage. for the rollers shall be so con- .-trolled as to render one of the roller sets inoperative fora; direct drive throughthe-trans mission. The roller cage -isr-lpreferably so ,con

trolled by means 50f a lost motion connection in order i thati the other, i set of rollers may be imigme'tiiatelygroperative when a: qdcwnshift is, made -from direct drive to 'acreduced fdrive.

:The inventionconsists' of the .novel construci-ions, :arrangements and devicesato be hereinafter-described and claimed for :carrying putrthe above stated 'objects and such otheraobjectslas "v ntio i I Fig. 2is' a'sectional view 'taken on line 2-2 Figs. 3 and' i are sectionalviewssimilar to Fig.

- 2 2 but with the illustrated parts being *in dii lerent relative positions.

Like characters of reference Si gna-te like partsin the. several views Referringnow in particular to Fig 1 oi the drawings, it will be observed thatthe illustrated transmission comprises a driving shaft ID, a driven shaft H and an intermediate shaft which is piloted with respect to both the shafts l8 ;and H. Thershafts are rotatably disposed within a transmission casing l3 -as show n. ,';lhe transmission.comprises two engine clutches 44 Land l5 which are econnected to warlonsparts of two planetarygear sets It, and Il for providing various drives through the transmission. flhe transmission comprises also-brakingrnechanism I8 tor a reaction element of the planetary gear .sets in order to provide various reduced ratio drives through the transmission as will be hereinafter more fully described.

- An engine flywheel I9 is connected to the'drive shaft Hi by means of a vibration dampener '20 which is used in the illustratedtransmission in .lieu of a vibration dampener for each of the clutches l4 and IS. The dampener comprises a plurality of springs 2| retained between' spaced lugs 22 on the flywheel l Brand tongues 23 on a hub member 24 bolted tothe drive shaft in.

The; clutch assembly comprisesa reaction plate '25 and an annular casting 26 bolted to the flywheel -l9. Aclutch'd scll fOIQthB-Qllltflh I4 is disposed between the flywheel l3 and thereaction plate illi, and aclutch disc n for the-clutch .15 is disposed-betweenthe reaction 1plateL25 and ntheriannular casting 26. t The" flywheel .ISisfpfO- vided with an annular chamberfiie in whichlan annularpistonflll is. slidably disposed, ,and the annular castin'g zfi is provided with a similar annular. chamber 3| in which an annular pistorijZ is slidablydisposed.

Theannular castingifi is provided with an oil collecting groove 33 which isin communication with an oil inlet openingt i' in the housing lfiand with an, oil .ducti 35 in theeas ting 26. "The'duot 35.18 in communication with the chamber} and oil under pressure may be admitted into the chamber to act on the piston "32 thrq gh the housing opening and duct 35". such application of fluidpressuretofthepiston -32"has the effect of engagingthe clutch-IS byclampingthe clutch disc 28 between the-piston '32 and the reaction plate 25. The annular casting 26 has another oil collecting groove 36 which isin communication with an opening inot shown) Jill the housing 13 similar to the opening .34, andcthe groove 36 isin communicationwith a duct-.31 in the casting 26 and plate 25 which in turn is in communication with the annular chamber 29 in the flywheel 19. The clutch l4 may be applied similarly to the clutch by application of fluid pressure to the collector groove 36 and thereby to the annular piston 36 which clamps the disc 21 between itself and the reaction member 25.

The planetary gear set |6 comprises a ring gear 46, a sun gear 4| cut on the intermediate shaft I2, a plurality of planet gears 42 in mesh with gear carrier 43 and that the carrier 43 i rotatably W disposed on the intermediate shaft l2 and is connected to the ring gear 44 of the gear set H. The clutch disc 2! is splined to the intermediate shaft l2 and is thereby connected directly to the sun gear 4|. The ring gear 40 of the gear set I6 is connected with the planet gear carrier 48 of the gear set N, and the ring gear and gear carrier may indeed constitute a single part. The gear carrier 48 is splined to the driven shaft II, as hown.

The brake mechanism I8 is effective on the reaction member 46 and comprises one set of rollers 49 and another set of rollers 59 (see Fig. 2). The

rollers

49 and 50 are disposed between a cylindrical internal surface 5| formed on the reaction member 46 and the hub portion 52 of a member 53 which is fixed within the casing 7 cylindrical surface 5| to prevent a rotation of l the reaction member 46 in a counterclockwise direction as seen in Fig. 3.

A cage 56 is provided for the

rollers

49 and 50, the cage 56 having a series of perforations or openings therethrough, one for each roller,

The cage 56 ha a portion 57 in frictional contact with the cylindrical surface 5| of the reaction member 46, and the cage is thus urged to rotatein the same direction as the reaction member 46. With the cage 56 having its motion unrestricted by any other means than the

rollers

49 and 56, the frictional. contact of the cage with the reaction member 46 causes the cage to move clockwise (see Fig. 2) if the direction of rotation of the reaction member is also clockwise, and this causes a wedging of the rollers 59 between the cams 54 and the cylindrical surface 5| to prevent further rotation of the reaction member 46 in this direction. Similarly a counterclockwise direction of rotation of the reaction member 46 causes a wedging of the rollers 49 between the cams 55 and the cylindrical surface 55 to prevent further such movement of the reaction member 46. Thus it will be apparent that allowing the cage 56 and thereby the rollers '59 cooperates with the opening 58.

49 and 56 unrestricted movement causes in effect a two-way braking of the reaction member 46, preventing a rotation of the reaction member 45 in either direction.

The roller cage 56 may be so controlled a to render one or the other of the sets of rollers 49 and ineffective. The cage is provided with an opening 53 adapted to receive the end of a piston 59 therein. The piston 59 is disposed in a cylindrical cavity 60 in the housing l3 and is adapted to be moved toward the cage 56 and the opening 58 by means of fluid pressure exerted on one side of the piston, and a spring 6| is provided for moving the piston in the opposite direction. The end of the piston 59 i chamfered at 62, as shown, in order to effect rotative movement of the cage 56 when fluid pressure is applied behind the piston, if such movement is necessary to align the opening 58 in the cage with the piston. It will be noted that the opening 58 is larger in diameter than the piston 59, and the piston 59 extending into the opening 58 thus connects the cage 56 and the casing l3 with a lost motion connection. With the piston 59 extending into the opening 56, the cage 56 may have such movement as to permit a wedging of the rollers 56 between the cams 54 and the cylindrical surface 5| to prevent a clockwise rotation of the reaction member 46, but the cage cannot move sufficiently in the opposite direction so that the rollers 49 may be effective to Wedge between the cams 55 and the cylindrical surface 5|. A free rotation of the reaction member 46 in the counterclockwise direction is thus permitted with the piston 59 extending into the opening 56.

The cage 56 is provided with another opening 63 therethrough with which a piston 64 is adapted to cooperate. The piston 64 is similar to the piston 59 and cooperates with the opening 63 in the cage in the same manner as the piston The piston 64 and the corresponding opening 63 in the cage are, however, so disposed as to limit the movement of the cage so that the rollers 49 may be effective to wedge between the cams 55 and the cylindrical surface 5| to prevent a counterclockwise rotation of the reaction member 46 while the piston 64 prevents sufficient movement of the cage 56 so that the rollers 59 cannot wedge between the cams 54 and the cylindrical surface 5|, and the reaction member 46 may freely rotate in the clockwise direction.

A friction brake 65 is provided for the ring gear 44, and this brake may be actuated by any suitable brake actuator, such as by a fluid pressure operated motor 66. The brake 65 is pro-' vided for completing a reverse drive through the transmission, as will be described.

A one-way coupling device 61 is provided between the intermediate shaft l2 and the drive shaft ID in order to allow an internal combustion engine (not shown) which may be connected to the drive shaft It to be started by driving the driven shaft H, as by pushing the automotive vehicle in which the transmission is installed, without an engagement of either of the friction clutches l4 or l5. This one-way cou pling device 61 comprises ratchet teeth 68 formed on the end of the intermediate shaft l2 and ratchet teeth 69 formed on a ring 19 which is splined within the shaft It. A piston H is fixed to the ring 19 and is slidably disposed in a cylindrical cavity 12 in the intermediate shaft [2. The piston H has a spring 13 disposed Sites,

therein and acting" between the shaft lllfand the piston, and the piston is also adapted to'loe acted on by fiuid pressure within the cavity 'I2,as will be apparent from an inspection ofjthe construction. "Fluid pressure within the cavity 12 which may be provided by suitable 'fluid' pressure producing v mechanism connected with the motor (not shown) of the vehicle causesthe piston to moveagainst the spring 13' to" its position in which it is shown with 'theteeth 61 and 69 being out of engagement. If, however, the motor should beout of operation, there would be no fluid pressure within the cavity 12 resulting from operation 'of the I motor, and. in. this case the spring [3 is eifective to movethe ring III to interengage the teeth, 69 with the teet 68.. This engagement, of the teeth ra sin 68 effectively connects the shaft I2 with'the shaft Ill, rendering; an engagement of eitherof the clutches "I4 or I5 unnecessary in order to provide "a connection between the shafts Ill and I I.

The illustrated transmission functions to provide low, intermediate and direct forward drives through the transmission and also a drive in reverse The transmission also .has a neutral condition for effectively disconnecting thedriven shaft-II from the. drive shaft III. For low and intermediate forward'drives, the pistons 5s and 64 areout of. interengagementwith the cageili leaving the cage freeto move-in ,accordance'with the direction of rotation of the reaction member 46. For low. speed forward drive,; the friction clutch I4 is engaged, andthe drive is then from theshaft. III through the flywheel IS the clutch I4','the intermediate shaft, I2, the two planet gear sets I6 and I1 to the driven shaft. The reaction member 46 is effective to provide the reactionpoint for the planet gear sets, and the brake mechanism I8 is effective to hold the. reaction member 46 stationary. Both of the sets of

rollers

49 and 50 may be effective, and a positive drive is thus effective either from the drive shaft Ill through the driven shaft II or from the driven shaft II to the 'driveshaft I9 as when the vehicle is coasting. When the drive shaft is driving, the reaction member 46 tends to rotate in the clockwise direction, and the brake mechanism I8 is'in the condition in which it is illustrated in Fig. 2 with the rollers l'afl preventing such rotation of the reaction member.

V For" intermediate forward speed "drive, the

clutch I4 is disengaged and theclutch I5 is "engaged. 1 The"- drive in this speed ratio is from the drive'shaft Ill through the flywheel I9, the clutch I5, the planet gear carrier 43 and the planet gear set I! to the driven shaft II. The 'brake'm'echanism I8 is effectivetohold there- .a'ction member 46 stationary in thisspeed'ratio infthesame manner as in low "speed ratio.

' For direct drive, both of the clutches I4and ISja're'engaged, and this 'has the efiect of looking upthe two planet gear sets I6 and I! so that all of theirparts. rotate at thesame speed and "in the'same direction as the drive shaft I6, and ,6

"the shaft II is drivenin the same manner as "are the parts of the gear set. in this'ispeed ratio, the piston 59 is made effective 'byapplifcation of fluid pressure to its rear surface, and the piston interengages with the opening 58in- "the cage 56. The reaction member "46 rotates in the "counterclockwise direction as seen in Fig. 3, andfthe pistonis efiectivetoprevent' wedging r'j 3149 betwe in e m: 5.5 'i n ji tee emsm for' this direction; of; rotation of the we action member 46 is in neutral condition.

In order to downshift the transmissionf'froin direct drive to intermediate speed drive, it is simply necessaryto release the clutch I Send the transmission is immediately in intermediate speed ratio. This is due to the lost motion connection between the piston 59'and the cage 56 allowing the rollers 50'- to become immediately effective to prevent a clockwise rotation of the reaction member 46 asseen in Fig. 2. If itis desired to makethis intermediate drive apositive drive for'both driving and coast conditions, A it'is simply neces'saryfto withdraw fluid pressure from thepiston 59allowing the spring GI to become effective to withdraw thepiston 59"from the opening 58 in the cage 56. s For reverse drive, the clutch I4 is engaged and the brake 65 is engaged. Thedrive'in'reverse is from the drive shaft IO'through the flywheel I 9, clutch I4, intermediate'shaft; l2, planet'gear Set I6 and planet gear carrier to the drivenshaft II. The reaction for reverse drive'is'taken by the reverse brake 6 5, and it is thus necessary that the brake mechanism I8 for the reaction member 46 be'disengaged, The piston'64 is'engaged with the cage-56 for performing this functionjand the piston 64 holds theca'ge' to prevent awedging of the rollers 50 between thecams 54 and the cy lin'd'rical surface 5|, the direction of rotation of'the reaction member 46 being in the clockwise direction as seenin Fig. 4.

If the motor'for driving the drive shaft III'is inoperative and it is desired to drive the motor for the purpose of starting it,"the 'shaf-t II is driven as by pushing the vehicle, and the ring 10 is in engaged position meshing the

teeth

69 and 68 to provide a drive from the shaft I I to the shaft), The clutch 61, it will be noted, is in parallel with the clutch I4, and the clutch 61 thus completes the low speed power train through the transmission from the shaft II to the shaft 40. Both of the pistons 59 and 64' are in their illustrated positions out of engagement with the cage 56', and the brake mechanism l8 is thus effective to hold the reaction member '46 stationary to provide a reaction point for the planetary gearing. Since the motor is not in operation," there is no fluid pressure within the cavity 12 in the shaft I2 to be effective against the action of the spring I3, as willbereadilyunderstood. U e i I V l 'wishit to be understood that my invention is notto be limitedto the specific constructions and arrangements shown and described, except only insofar as the claims may be so limited, as it will be apparent to those skilled in the art that changes may be "made without departing from the principles of the invention.

1; In transmission mechanismthe combinationfofa drive shaft, a driven shaft, 'gearln'g'for providing a, powe'r trainbetween said Shafts including a reaction member forj'c'ompleting the power train when braked, braking mechanism for said reaction member, said mechanism being self-engaging simultaneously for either direction of transmission of power from said drive shaft to said drivenshaft or vice versa and having a neutral condition, means for selectively limiting the braking mechanism to engage for only one of said directions of transmission of "power and jlgeeping it in its neutral conditionio'r the other "direction. an means for "sleetiv'ely limitingthe Erasing "meesaiusmte'eiigeeersr divestiture direction of transmission of power and keeping it in its neutral condition for said one direction of transmission of power.

2. In transmission mechanism, the combination of a drive shaftfa driven shaft, gearing for providing a reduced speed power train between said shafts, and including a reaction member for completing the power train when braked, braking mechanism for said reaction member, said mechanism being self-engaging for either direction of transmission of power from said drive shaft to said driven shaft or vice versa and having a neutral condition, and means providing a higher speed ratio power train between said shafts and including means for selectively holding said braking mechanism in its neutral condition when said higher speed power train is effective.

3. In transmission mechanism, the combina tion of a drive shaft, a driven shaft, gearing for providing a reduced speed power train between said shafts and including a reaction member for completing the power train when braked, braking mechanism for said reaction member, said mechanism being self-engaging for either direction of transmission of power from said drive shaft to said driven shaft or vice versa and having a neutral condition, and means for selectively providing a one-to-one speed ratio power train between said shafts which tends to cause the same engagement of said braking mechanism as would be caused by a drive through said gearing from said driven shaft to said drive shaft and including means for simultaneously holding said braking mechanism in its neutral condition when the one-to-one speed ratio power train is .eifective,

4. In transmission mechanism, the combination of a drive shaft, adriven shaft, gearing for providing. a reduced drive power train-between said shafts and including a reaction member for completing the power train for both directions of transmission of power from said drive shaft to saiddriven shaft when braked, braking means for said reaction member, said braking means comprising a one-way roller clutch mechanism for each of said directions of. transmission of power and having a neutral condition, and means for selectively providing a one-'to-one speed ratio power train between said shafts, said one-to-one power train tending to cause the same engagement of said braking means as is caused by a .drivefrom said driven shaft to said drive shaft through said gearing, said means for selectively providing said one-to-one speed ratio power train including means for holding said braking means in its neutral condition during the completion of the one-tO-one power train.

5. In transmission mechanism, the combination of a drive shaft, a driven'shaft, gearing for providing a reduced drive power train between said shafts and including a reaction member, braking mechanism for said reaction member for completing said power train, said braking mechanism comprising two oppositely acting one-way clutchmechanisms which are self-engaging for either direction of transmission of power from said drive shaft to said driven shaft or vice versa and having a neutral condition, means for selectively providing a one-to-one speedratio power train between said shafts, said one-to-one power train tending to cause engagement of the same one-way clutch mechanism which is engaged for a transmission of power from said driven shaft to. said drive shaft through said gearingand selectively operable means for holding said last named one-way clutch mechanism disengaged for the one-to-one speed ratio power train.

In transmission mechanism, the combination of a drive shaft, a driven shaft, gearing for providing a reduced speed ratio power train between said shafts and comprising a reaction member, a brake for said reaction member for completing said power train, said brake comprising two oppositely acting one-way clutch mechanisms which are self-engaging for both directions of transmission'of' power from said drive shaft to said driven shaft or vice versa and having a neutral condition, means for selectively providing a one-to-one drive between said shafts, said one-to-one power train tending to cause an "engagement. of the one-way clutch mechanism which would be engaged for a drive from said driven-shaft to said-- drive shaft through said gearing, and selectively operable means for pre-'- "Venting said last named clutch mechanism from engaging but allowing the other clutch mechanism to engage for the one-to-one speed ratio power train.

- -7. In transmission mechanism, the combina tion of a drive shaft, a driven shaft, gearing for providing a low speed power train between said shafts, a brake for completing said power :train and comprising two parts adapted to engage with respect to each othen said brake including two sets" of rollers one of which engages the: parts for one relatived-ire'ction of rotation of the parts and other of which engages the said parts for the other relative direction of rotation of the parts, said brahe'being capable of assuming a neutral condition, means for selectively providing a higher speed. power train between said shafts, and selectively operable means for holding said gage with respect to each other, said brake-including two sets of rollersof which one engages the parts for one relative direction of rotation of the parts and the other of which engages said parts for the otherrelative direction of rotation of parts and brake being capable of assuming a neutral condition, means for selectively providing a one-to-one speed ratio power train-between said shafts, said one-to-one power" train tending to cause-engagement of the set of rollers which would be engaged by a drive from said driven shaft to said drive shaft through said gearing, a cage for said rollers for controlling the same, and means for limiting the movementof said cage and thereby of said rollers whereby to prevent engagement of said last namedset of rollers when saidone-to-one speed ratio is effec -tive through the transmission.

9. In transmissionmechanism, the combination of a drive shaft, a driven shaft, gearing. for providing a reduced speed ratio power trainbetween said shafts and having a reaction member, a brake for said reaction member for completing said power train, said brake comprising two sets of rollers one of which engages for preventing movement of said reaction member in one direction and the other of which engages for preventing rotation of the reaction member in the other direction, a cage for saidrollersfor controlling the same, means for selectively providing a one-to-one speed ratio power train between said shafts, and means for selectively controlling the movement of said cage and thereby of said rollers and including a lost motion connection with the cage selectively made operative for preventing one of said sets of rollers from engaging to brake said reaction member whereby to allow said one-to-one power train between said shafts but allowing the other set of rollers to engage.

10. In transmission mechanism, the combination of a drive shaft, a driven shaft, gearing for providing a two-way forward drive power train between said shafts and including a reaction member for completing the power train when braked, braking mechanism for said reaction member, said braking mechanism being self en gaging simultaneously for either direction of transmission of power from said drive shaft to said driven shaft and having a neutral condition, and clutch means for providing a second two-way forward drive power train between said shafts and including means enabling the completion of said second two-way drive power train and. for selectively keeping the braking mechanism in neutral condition in either direction of transmission of power between said shafts, whereby the braking mechanism is disengaged when said second two-way forward drive power train is completed.

11. In transmission mechanism, the combination of a drive shaft, a driven shaft, gearing for 10 providing a two-way forward drive power train between said shafts and including a reaction member for completing the power train when braked, braking mechanism for said reaction member, said braking mechanism being self engaging simultaneously for either direction of v transmission of power from said drive shaft to said driven shaft and having a neutral condition, and clutch means for providing a reverse drive power train between said shafts and including means for selectively keeping the brake mechanism in neutral condition in either direction of transmission of power between said shafts whereby the braking mechanism is disengaged when said reverse drive power train is completed.

DONALD W. KELBEL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,718,074 Reece June 18, 1929 1,823,389 DeLavaud Sept. 15, 1931 1,865,910 Hobbs July 5, 1932 1,942,197 Blackstock Jan. 2, 1934 1,978,416 Dodge Oct. 30, 1934 2,209,695 Heinze July 30, 1940 2,353,905 Kelley July 18, 1944 2388,700 Morrill Nov. 13, 1945 2,395,459 Carnagua Feb. 26, 1946